fix rendering on vim

[callmekohei]

Hello! I'm callmekohei! (^_^)/

problem

syntax file make it slow rendering on vim.

fsharpModule       \%(\<open\s\+\)\@<=[a-zA-Z.]\+
fsharpTypeName     \%(\<type\s\+\)\@<=\w\+

Environment

$ sw_vers 
ProductName:    Mac OS X
ProductVersion: 10.13.4
BuildVersion:   17E202

$ vim --version | head -n 5
VIM - Vi IMproved 8.1 (2018 May 17, compiled May 22 2018 22:51:49)
macOS version
Included patches: 1
Compiled by Homebrew
Huge version without GUI.  Features included (+) or not (-):

Test

prepare syntax file and test file

$ mkdir foo
$ cd foo/
$ wget 'https://raw.githubusercontent.com/fsharp/vim-fsharp/master/syntax/fsharp.vim' -P './rc/syntax/'
$ wget https://gist.github.com/callmekohei/a48caad1fe0849099131c10385505999#file-foo-fsx

create minimal.vimrc

$ vim minimal.vimrc

" set path, set filetyp
set runtimepath+=./rc
autocmd BufNewFile,BufRead *.fsx  set filetype=fsharp

" turn plugins on
syntax enable
filetype plugin indent on

" flag
" set regexpengin=1

create test report ( see vim help :h syntime )

# open foo.fsx
$ vim -N -u minimal.vimrc foo.fsx 

# start test mode
: syntime on

# redraw 10 times
<C-l>
<C-l>
<C-l>
<C-l>
<C-l>
<C-l>
<C-l>
<C-l>
<C-l>
<C-l>

# end test mode
: syntime off

# put report
: redir > foo.txt
: silent syntime report

create bar.txt

# comment out in minimal.vimrc
$ vim minimal.vmrc
set regexpengin=1

# do test
...
: redir > bar.txt
: silent syntime report

result

foo.txt

regexpengine=0
 TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN
 1.659369   330    30      0.011410    0.005028  fsharpModule       \%(\<open\s\+\)\@<=[a-zA-Z.]\+
 1.578941   330    0       0.009866    0.004785  fsharpTypeName     \%(\<type\s\+\)\@<=\w\+
 0.021088   330    0       0.000144    0.000064  fsharpSymbol       \%(let\|use\|mutable\|rec\|and\|private\)\@<=!\=\s\+\z
 0.015800   330    0       0.000098    0.000048  fsharpSymbol       \%(member\)\@<=\s\+\w\+\.\zs\w\+
 0.013732   270    0       0.000092    0.000051  fsharpRegion       \%(end\)\@<!region.*$
 0.012374   360    60      0.000085    0.000034  fsharpNumber       \<-\=\d\(_\|\d\)*\(u\|u\?[yslLn]\|UL\)\?\>
 0.011798   330    0       0.000074    0.000036  fsharpFloat        \<-\=\d\(_\|\d\)*\.\(_\|\d\)*\([eE][-+]\=\d\(_\|\d\)*\
 0.011766   330    0       0.000084    0.000036  fsharpNumber       \<-\=0[o|O]\(\o\|_\)\+\(u\|u\?[yslLn]\|UL\)\?\>

bar.txt

regexpengine=1
 TOTAL      COUNT  MATCH   SLOWEST     AVERAGE   NAME               PATTERN
 0.265682   330    30      0.001915    0.000805  fsharpModule       \%(\<open\s\+\)\@<=[a-zA-Z.]\+
 0.225018   330    0       0.001335    0.000682  fsharpTypeName     \%(\<type\s\+\)\@<=\w\+
 0.005389   330    0       0.000067    0.000016  fsharpSymbol       \%(let\|use\|mutable\|rec\|and\|private\)\@<=!\=\s\+\z
 0.004259   330    0       0.000035    0.000013  fsharpCharacter    '\\\d\d\d'\|'\\[\'ntbr]'\|'.'
 0.003339   330    0       0.000024    0.000010  fsharpCharErr      '\\\d\d'\|'\\\d'
 0.002938   270    0       0.000022    0.000011  fsharpString       \\\\\|\\"
 0.002282   330    0       0.000041    0.000007  fsharpSymbol       \%(member\)\@<=\s\+\w\+\.\zs\w\+
 0.002089   360    60      0.000018    0.000006  fsharpNumber       \<-\=\d\(_\|\d\)*\(u\|u\?[yslLn]\|UL\)\?\>

additional info

Two options ( number, nowrap ) makas more slow. 😢

" You fell more slow if you add two options.
set number
set nowrap

[mattn]

ping @kjnilsson

[kjnilsson]

Cheers! Sorry about the delay!

[callmekohei]

Wow! Thank you very much!!!!

Thank you @kjnilsson !!! Thank you @mattn !!!